B757-200 CREW WAS GIVEN AN ATC RERTE THROUGH AN AREA THAT HAD FORECAST TURB.

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I WAS THE CAPT ON ACR X; FLT XXXX; FROM DETROIT; MI; TO LAS VEGAS; NV. WE WERE IN THE AREA OF GOODLAND (GLD) AT 39000 FT AT ABOUT XA00Z WORKING WITH ATC. WE WERE GIVEN A RTE CHANGE TO PROCEED TO MILE HIGH (DVV). J60. BRYCE CANYON; LAS VEGAS. THE NEW RTE WOULD BE PUTTING US IN THE SOUTHERN SECTION OF A RPTED TURBULENCE PLOT AREA FOR MOUNTAIN WAVE ACTION FROM FL340 TO FL430. I ASKED THE CTLR IF THERE HAD BEEN ANY RIDE COMPLAINTS ACROSS THIS RTE. HE SAID THERE HAD ONLY BEEN RPTS OF LIGHT CHOP. THE RTE CHANGE HAD BEEN MADE AT THE REQUEST OF LOS ANGELES CENTER BECAUSE OF TFC CONGESTION. WE WERE WELL BELOW THE TROPOPAUSE (WHICH WAS AT FL520) AND I FIGURED IF IT DID GET ROUGH; I COULD DSND BELOW FL340. MY DISPATCHER WAS NOT AS CONTENT WITH THE NEW RTE BASED ON THE ACR TURBULENCE PLOT. SINCE HE WAS NOT HAPPY; AND BY DEFINITION WE JOINTLY SHARE THE RESPONSIBILITY OF THE FLT; I REQUESTED MY ORIGINAL FILED RTE BACK. I WAS TOLD BY ATC THAT IF I DID THAT; THEY WOULD HAVE TO HOLD ME FOR 15 MINS IN MY PRESENT POS. I SAID THAT I WOULD HAVE TO ACCEPT THE HOLD IF THAT IS WHAT THEY HAD TO DO. ULTIMATELY; WE WERE TURNED NORTH AND THEN CONTINUED A RIGHT TURN TO GLD AND THEN GIVEN REMAINDER OF ORIGINAL RTE WHICH TOOK US OUT OF THE TURB PLOT AREA. WE HAD A SMOOTH FLT. I FEEL THAT I COULD HAVE PREVENTED THIS SIT IF I WOULD HAVE SIMPLY CALLED MY DISPATCHER PRIOR TO ACCEPTING THE RTE CHANGE AND KEEPING HIM IN THE LOOP. IN YEARS PAST; WE ALWAYS HAD THE DISPATCHERS AVAILABLE TO US IF WE NEEDED THEM. I BELIEVE THAT I AM ULTIMATELY THE BOTTOM LINE WHEN DECISIONS ARE MADE CONCERNING THE SAFE OPERATION OF MY FLTS. THESE DECISIONS ARE MADE AFTER COLLECTING INFO FROM AS MANY SOURCES AS POSSIBLE. IN THIS CASE I DIDN'T USE ALL AVAIL SOURCES.